On Sun, Feb 28, 2016 at 01:08:29AM +0100, Marc Haber wrote: > On Sun, Feb 28, 2016 at 12:15:21AM +0100, Martin Steigerwald wrote: > > On Samstag, 27. Februar 2016 22:14:50 CET Marc Haber wrote: > > > I have again the issue of no space left on device while rebalancing > > > (with btrfs-tools 4.4.1 on kernel 4.4.2 on Debian unstable): > > > > > > mh@fan:~$ sudo btrfs balance start /mnt/fanbtr > > > ERROR: error during balancing '/mnt/fanbtr': No space left on device > > > mh@fan:~$ sudo btrfs fi show /mnt/fanbtr > > > mh@fan:~$ sudo btrfs fi show -m > > > Label: 'fanbtr' uuid: 4198d1bc-e3ce-40df-a7ee-44a2d120bff3 > > > Total devices 1 FS bytes used 116.49GiB > > > devid 1 size 417.19GiB used 177.06GiB path /dev/mapper/fanbtr > > > > Hmmm, thats still a ton of space to allocate chunks from. > > > > > mh@fan:~$ sudo btrfs fi df /mnt/fanbtr > > > Data, single: total=113.00GiB, used=112.77GiB > > > System, DUP: total=32.00MiB, used=48.00KiB > > > Metadata, DUP: total=32.00GiB, used=3.72GiB > > > GlobalReserve, single: total=512.00MiB, used=0.00B > > > mh@fan:~$ > > > > > > The filesystem was recently resized from 300 GB to 420 GB. > > > > > > Why does btrfs fi show /mnt/fanbtr not give any output? Wy does btrfs > > > fi df /mnt/fanbtr say that my data space is only 113 GiB large? > > > > Cause it is. > > > > The "used" in "devid 1" line is btrfs fi sh is "data + 2x system + 2x > > metadata > > = 113 GiB + 2 * 32 GiB + 2 * 32 MiB, i.e. what amount of the size of the > > device is allocated for chunks. > > > > The value one line above is what is allocated inside the chunks. > > > > I.e. the line in "devid 1" is "total" of btrfs fi df summed up, and the > > line > > above is "used" in btrfs fi df summed up. And… with more devices you have > > more > > fun. > > Why wouldn't btrfs allocate more data chunks from the ample free space?
It's a bug. It's been around for years (literally), but nobody's tracked it down and fixed it yet. Hugo. -- Hugo Mills | We believe in free will because we have no choice. hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 |
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